The easiest thing would be to take some of the multitude of tree silhouettes online and go from there. I've even thought about using them as flats for backgrounds as a test to see if it works before putting a lot of effort into it.

Something like this:

I doubt you finish cutting out the first one before you decide it's not worth it.

In the stone age of 3D, we used opacity maps to create flat (two dimensional) trees because no regular computer could handle the polygon count of a three dimensional tree, much less a scene of them. The trick was that the tree would have a 'look at' type function where it would always be facing perpendicular to the camera like Mickey Mouse ears. It wasn't always ideal, but generally looked as good as most things those days.

Flat trees in a real world setting aren't going to be very convincing I don't think.

Blender has a tree generating plug-in someone could try. All of that should be free.

I doubt you finish cutting out the first one before you decide it's not worth it.

That is exactly what I said, few posts earlier - the number of supports might be greater than the number of branches, and many supports will be buried deep inside the fine canopy of branches (almost impossible to remove). But then DKS said that he thinks that just the main trunk and large branches might be realistically printed.

I was looking at the various shape generators available in Tinkercad, and came across a random tree generator...

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It might be possible to print this on the anycubic photon with almost no supports. It might even be possible to first import this into Meshmixer to apply a textured effect on the trunk/branches with one of the brushes.

It's not much, but hey, it's a free tree generator

Note that I have no plans to try it out, I just remembered this thread when I came across the shape generator. Enjoy!

You know, this might be something that could be done with Sculptris. I haven't played around with it much, too many other things to work on, but it might be reasonably easy to do. I'm not sure you could get really intricate branches, but the larger form should be relatively simple.